run python3 script on linux apache 2.4

Question

I have looked everywhere and tried many suggested solutions, still without the required result: to run a python file from my lamp server. I can not seem to integrate all the pieces of the puzzle ... Complicating the story is that many solutions either use old apache version (<2.4), which changed the config files significantly. No more httpd.conf! so this executing-a-python-script-in-apache2 does not help; But also the python version being > 3 complicates matters.

specs:

linux Kubuntu, apache 2.4, python 3.5
apache is running
website files are in root/var/www/html/, I have sudo access to this folder.
apache2 cgi module enabled: a2enmod cgi
the python 3.5 path is usr/bin/env python3

the python script, simplest of scripts, has been made executable

#!/usr/bin/env python3

print ("Content-type: text/html\n")
print ("Hello world!")

lets boil it down to the simplest case: I would like to have apache interpret the spark.py script and spit out the html: "Hello world!"

Questions:

is the script file correct as is?
which config files do I need to change and what do I need to add to these config files?

I know for security reasons, you should not have apache run script in your root dir.

Look into mod_wsgi, it's much better than plain old CGI. The main Ubuntu archives have a libapache2-mod-wsgi-py3 package, I'm sure there's one available for Kubuntu as well. — MattDMo
– MattDMo, Commented Jan 8, 2017 at 17:25
I am looking into the wsgi modules, but that seems to be even harder to get implemented. Maybe you have a very basic simple example of this? — hewi
– hewi, Commented Jan 20, 2017 at 16:57
I have google'd it into oblivion, believe me, hence the delay in my response :) don't forget youtube, also quite helpfull, but none of the examples are really explaining a-to-z, where does the wsgi script lives, what are the apache server settings, where does your actual application live? Google "basic python wsgi example" reveals 155,000 results, I just check and I have actually visited aprox 60 links, still not working :( anyway, thanks for your energy, I will post a new question ... — hewi
– hewi, Commented Jan 21, 2017 at 19:06

Devakhim · Accepted Answer · 2017-04-12 08:11:32Z

6

The python documentation for modwsgi seems to fit what you are asking for. The following webpage has a really simple example and the necessary configuration for a python3-apache2 setup.

http://modwsgi.readthedocs.io/en/develop/user-guides/quick-configuration-guide.html

You will need to install the mod_wsgi for the configuration to work. Take note of the different "_" underscore and "-" dash character used in apt and pip3.

$ sudo apt install apache2-dev libapache2-mod-wsgi-py3
$ sudo pip3 install mod_wsgi

libapache2-mod-wsgi-py3 and mod_wsgi seems to be the same thing. However, my test deployment only works after installing mod_wsgi. Could be configuration issue. The following are the details of the configuration I have tested on Ubuntu 16.04.2.

Application file /home/user/wsgi_sample/hello.wsgi:

def application(environ, start_response):
    status = '200 OK'
    output = b'Hello World!'
    response_headers = [('Content-type', 'text/plain'),
                    ('Content-Length', str(len(output)))]
    start_response(status, response_headers)
    return [output]

Apache2 configuration /etc/apache2/sites-available/000-test.conf

<VirtualHost *:80>
  ServerName testmachine
  <Directory /home/user/wsgi_sample>
    Order allow,deny
    Allow from all
    Require all granted
  </Directory>
  WSGIScriptAlias /hello /home/user/wsgi_sample/hello.wsgi
</VirtualHost>

Enable the site in apache2.

sudo a2ensite 000-test.conf

Open your browser to testmachine/hello.

wsgi may also be deployed on Apache2 using passenger. It demands a slighter longer configuration. Ask a new question if passenger/python3 is desired.

edited Apr 12, 2017 at 8:11

answered Apr 12, 2017 at 3:00

Devakhim

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1 Comment

Fabian Horlacher Over a year ago

Welcome to Stack Overflow. Always quote the most relevant part of an important link, in case the target site is unreachable or goes permanently offline.

Stan S. · Accepted Answer · 2019-09-24 09:45:57Z

0

Yes, your minimum code seem correct. The Apache config information is answered here https://stackoverflow.com/a/57531411/4084546

answered Sep 24, 2019 at 9:45

Stan S.

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